That's right: The world's top cycling officials believe that pro cyclists, such as those who compete in the world's largest annual sporting event, the Tour de France, may be cheating by installing motors in their bikes to make them go faster.

Last month at the Giro d'Italia — the most important stage race after the Tour — an official was shown on video checking eventual race winner Alberto Contador's bike very thoroughly, even removing the cranks:

Alas, the UCI found nothing to indicate mechanical doping in Contador's bike.

The rider later told Cyclingnews this much after it was suggested that a bike change he'd made during the race was suspicious and could have been because he was using a motor in one of his bikes:

"My bike doesn't have three motors — it has five! The whole thing about motors is a joke, it comes from the world of science fiction," he said. "The changes depend on how the stage unfolds. We can use different type of tubulars, bearings or even stiffer wheels. These are solutions that over 30-40km can give a slight advantage. It's got nothing to do with motors."

So what was once snarked about on social media as a joke is something that cycling officials are taking quite seriously — so much so that they've added new rules, fines, and penalties to the UCI's rulebook:

"If caught with a hidden motor, a rider could face a fine of 20,000 to 200,000 Swiss francs (or $21,411 to 214,164) and a minimum six-month suspension," VeloNews reports.

Also according to VeloNews, quoting a UCI report, the recent "controls" came about, in part, after a "Commission was told of varying efforts to cheat the technical rules, including using motors in frames."

"[Canadian pro Ryder] Hesjedal's was one of five bikes snatched at the finish line by men in dark blue UCI polo shirts as part of an ongoing effort to root out what has, thus far, proven to be a unicorn of a rule violation — a bike that powers itself. Though the technology does exist, few pros seem to think it feasible," VeloNews reports.

The UCI president, Brian Cookson, told CyclingTips that the governing body was taking the matter of possible mechanical doping seriously: "Our information is that this is a very real possibility. We don't have any firm evidence but we are absolutely aware that these products are out there and that it is a possibility.

"Given that there have been various allegations and rumours and evidence given to the CIRC that this was a potential area of cheating, we have obviously decided that this is something we should check up on on a regular basis."

This clip, for instance, shows Hesjedal's bike after he wiped out during the 2014 Tour of Spain. His rear wheel appears to keep spinning after the crash, so much so that it whips the bike around on the ground after he himself comes to a stop:

Many on the internet went nuts at seeing this, and then of course a guy made a video claiming that, no, Hesjedal didn't have a motor in his bike and that it's perfectly normal for his wheel to do what it did given its momentum:

And this video below — which has 3.6 million views on YouTube — claims to show "how mechanic doping may be done," with images of Swiss pro Fabian Cancellara that "may be considered as incontrovertible evidences."

It's important to note that Cancellara and his team denied all of this long ago, and they were never penalized or fined.

As CyclingWeekly reported at the time, "The story is completely mad and stupid that I can't find the words to respond. I have never had a battery on my bike," Cancellara told La Gazzetta dello Sport. "I go that strong because I work hard, there is nothing else to say."

FWIW, here's the video:

Hesjedal, speaking with VeloNews at last month's Giro, seemed to sum up what many who follow the sport are saying: "It's the stupidest thing. It's the most ridiculous thing I've ever heard of ... It's not possible. It's just not possible."

With the Tour de France coming up in July, you can be sure the checks for mechanical doping will continue.